#include <AuthenticationService.h>

AuthenticationService::AuthenticationService(AsyncWebServer* server, SecurityManager* securityManager):
  _server(server), _securityManager(securityManager) {    
  server->on(VERIFY_AUTHORIZATION_PATH, HTTP_GET, std::bind(&AuthenticationService::verifyAuthorization, this, std::placeholders::_1));

  _signInHandler.setUri(SIGN_IN_PATH);
  _signInHandler.setMethod(HTTP_POST);
  _signInHandler.setMaxContentLength(MAX_AUTHENTICATION_SIZE);
  _signInHandler.onRequest(std::bind(&AuthenticationService::signIn, this, std::placeholders::_1, std::placeholders::_2));
  server->addHandler(&_signInHandler);
}

AuthenticationService::~AuthenticationService() {}

/**
 * Verifys that the request supplied a valid JWT.
 */
void AuthenticationService::verifyAuthorization(AsyncWebServerRequest *request) {
  Authentication authentication = _securityManager->authenticateRequest(request);
  request->send(authentication.isAuthenticated() ? 200: 401);
}

/**
 * Signs in a user if the username and password match. Provides a JWT to be used in the Authorization header in subsequent requests.
 */
void AuthenticationService::signIn(AsyncWebServerRequest *request, JsonDocument &jsonDocument){
  if (jsonDocument.is<JsonObject>()) {
    String username =  jsonDocument["username"];
    String password = jsonDocument["password"];
    Authentication authentication = _securityManager->authenticate(username, password);
    if (authentication.isAuthenticated()) {
      User* user = authentication.getUser();      
      AsyncJsonResponse * response = new AsyncJsonResponse(MAX_AUTHENTICATION_SIZE);
      JsonObject jsonObject = response->getRoot();
      jsonObject["access_token"] = _securityManager->generateJWT(user);
      response->setLength();
      request->send(response);
      return;
    }
  }
  AsyncWebServerResponse *response =  request->beginResponse(401);
  request->send(response);
}

